Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Micro-CT (micro-computed tomography) based non-uniform Voxel grid discretization method for three-dimensional braided composite material

A composite material and three-dimensional weaving technology, applied in image data processing, special data processing applications, instruments, etc., can solve problems such as discrete grids, and achieve the effects of avoiding errors, reducing calculations, and reducing scale

Active Publication Date: 2016-12-07
HARBIN INST OF TECH
View PDF2 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of in-situ modeling of the mesoscopic structure of three-dimensional braided composite materials and the difficult grid discretization problem, thereby forming a non-uniform Voxel grid discretization method based on Micro-CT three-dimensional braided composite materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Micro-CT (micro-computed tomography) based non-uniform Voxel grid discretization method for three-dimensional braided composite material
  • Micro-CT (micro-computed tomography) based non-uniform Voxel grid discretization method for three-dimensional braided composite material
  • Micro-CT (micro-computed tomography) based non-uniform Voxel grid discretization method for three-dimensional braided composite material

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0045] Specific implementation mode one: combine figure 1 The non-uniform Voxel grid discretization method based on Micro-CT three-dimensional braided composite material in this embodiment is specifically prepared according to the following steps:

[0046] Step 1. Based on the micro-CT slice scanning of the internal weaving structure of the three-dimensional braided composite material, identify and scan the slice images of different gray levels. In the slice image, the gray scale of the fiber bundle and the matrix is ​​very different. Through the gray scale slice According to the gray value of different fiber bundles and matrix materials in the layer image, the threshold histogram of fiber bundles and matrix is ​​counted to determine the region segmentation threshold, and the binary image of the gray slice image is obtained according to the region segmentation threshold; among them, the scanned gray The sheet image is the image of the internal weaving structure of the three-di...

specific Embodiment approach 2

[0070] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the gray values ​​of the different fiber bundles and matrix materials in the gray-scale sheet image described in step 1 are specifically:

[0071] g ( j , j ) = 1 ... ... f ( i , j ) ≥ H 0 ... ... f ( i , ...

specific Embodiment approach 3

[0073] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that after the denoising process is performed on the binary image of the sheet image in step 2, the boundary between the smooth matrix region and the inner region of the fiber bundle will be smoothed The fiber bundle boundary is subjected to geometric vectorization processing, and the cross-sectional shape of the fiber bundle is determined by the polygon as follows:

[0074] Step 21, performing an opening operation and a closing operation on the binary image of the slice image to eliminate the long and narrow gaps and small holes in the binary image of the slice image;

[0075] Step 22: Denoise the interior of the matrix and the interior of the fiber bundles using image erosion and expansion techniques, that is, remove other pixels distributed in dots and dots inside the matrix and fiber bundles to obtain the denoised matrix area and fiber bundle area (i.e. smooth Matrix region and fiber bundl...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a Micro-CT (micro-computed tomography) based non-uniform Voxel grid discretization method for a three-dimensional braided composite material, relates to a non-uniform Voxel grid discretization method, and aims to solve the problems of mesostructure in-situ modeling and relatively difficult grid discretization of the three-dimensional braided composite material. The method comprises steps as follows: step one, binary images of gray-level sheet images are obtained; step two, a cross section shape of a fiber bundle is determined; step three, local coordinate information of the fiber bundle is obtained according to a fiber bundle path; step four, a direction of local coordinates at each cross section center point of the fiber bundle along the fiber bundle path is determined; step five, a geometric model of a mesostructure of the three-dimensional braided composite material is generated; step six, Voxel grids on the boundary of the fiber bundle and the boundary of a matrix are obtained; step seven, whether the new Voxel grids belong to the fiber bundle or the matrix is defined; step eight, the new Voxel grids are discretized into non-uniform Voxel grids. The method is applied to the field of finite element modeling of the three-dimensional braided composite material with a complicated braided structure.

Description

technical field [0001] The invention relates to a method for discretizing non-uniform Voxel grids of composite materials, in particular to a method for discretizing non-uniform Voxel grids of composite materials based on Micro-CT three-dimensional weaving. Background technique [0002] Three-dimensional braided composite material is a material formed by impregnating a three-dimensional braided prefabricated body into a matrix and then cured. It is widely used in aviation, aerospace, transportation, wind energy and other fields. The performance of 3D braided composites depends on the microscopic weaving structure of the material, so it is necessary to model and analyze the material from the microscopic point of view. At present, a relatively mature method is to use the method of representing the volume unit cell to analyze the performance of the material. At the same time, because the three-dimensional braided composite material has a complex fiber texture in space, it is oft...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F17/50G06T17/30
CPCG06F30/23G06T17/30G06T2200/04G06T2207/10072
Inventor 方国东陈城华梁军
Owner HARBIN INST OF TECH
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com